Manganese(II) oxide


Manganese(II) oxide
Manganese(II) oxide
Identifiers
CAS number 1344-43-0 YesY
PubChem 14940
RTECS number OP0900000
Properties
Molecular formula MnO
Molar mass 70.9374 g/mol
Appearance green crystalline
Density 5.37 g/cm3 (23 °C)
Melting point

1945 °C

Solubility in water insoluble
Refractive index (nD) 2.16
Structure
Crystal structure Halite (cubic), cF8
Space group Fm3m, No. 225
Coordination
geometry
Octahedral (Mn2+); octahedral (O2–)
Hazards
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Manganese difluoride
Manganese(II) sulfide
Other cations Iron(II) oxide
Related manganese oxides Manganese(II,III) oxide
Manganese(III) oxide
Manganese dioxide
Manganese heptoxide
 YesY oxide (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Manganese(II) oxide is the inorganic compound with formula MnO.[1] MnO is a basic oxide that is insoluble in water but dissolves in acids, forming manganese(II) salts.[2]

Contents

Preparation and occurrence

MnO can be prepared by the reduction of any higher oxide with hydrogen[2] e.g.:

MnO2 + H2 → MnO + H2O

Commercially it is prepared by reduction of MnO2 with hydrogen, carbon monoxide or methane:[1]

MnO2 + CO → MnO + CO2

MnO can also be prepared by heating MnCO3:[3]

MnCO3 → MnO + CO2

This calcining process is conducted anaerobically to prevent formation of Mn2O3. MnO occurs in nature as the rare mineral manganosite.

Structure and properties

MnO has the NaCl, rock salt structure, where cations and anions are both octahedrally coordinated.[2] The composition of MnO can vary from MnO to MnO1.045.[2]
Below 118 K MnO is antiferromagnetic.[2] MnO has the distinction of being one of the first compounds[4] to have its magnetic structure determined by neutron diffraction in 1951.[5]. This study showed that the Mn2+ ions form a face centered cubic magnetic sub-lattice where there are ferromagnetically coupled sheets which are anti-parallel with adjacent sheets.

Applications

Together with manganese sulfate, MnO is a component of fertilizer and feed additives. Many thousands of tons are consumed annually for this purpose.[1]

References

  1. ^ a b c Arno H. Reidies "Manganese Compounds" Ullmann's Encyclopedia of Chemical Technology 2007; Wiley-VCH, Weinheim. doi:10.1002/14356007.a16_123
  2. ^ a b c d e Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419. 
  3. ^ W.H. McCarroll (1994) Oxides- solid sate chemistry, Encyclopedia of Inorganic chemistry Ed. R. Bruce King, John Wiley & Sons ISBN 0-471-93620-0
  4. ^ J.E Greedon, (1994), Magnetic oxides in Encyclopedia of Inorganic chemistry Ed. R. Bruce King, John Wiley & Sons ISBN 0-471-93620-0
  5. ^ Neutron Diffraction by Paramagnetic and Antiferromagnetic Substances C. G. Shull, W. A. Strauser, and E. O. Wollan, Phys. Rev. 83, 333 - 345 (1951), doi:10.1103/PhysRev.83.333

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  • manganese(IV) oxide — mangano(IV) oksidas statusas T sritis chemija formulė MnO₂ atitikmenys: angl. manganese black; manganese dioxide; manganese(IV) oxide rus. марганца диоксид; марганца(IV) оксид; марганцевая черная ryšiai: sinonimas – mangano dioksidas sinonimas –… …   Chemijos terminų aiškinamasis žodynas

  • manganese(II) oxide — mangano(II) oksidas statusas T sritis chemija formulė MnO atitikmenys: angl. manganese(II) oxide rus. марганца(II) оксид …   Chemijos terminų aiškinamasis žodynas

  • manganese(III) oxide — noun see manganese sesquioxide …   Useful english dictionary

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